merkle-patricia-tree/dist.browser/checkpointTrie.js

"use strict";
var __extends = (this && this.__extends) || (function () {
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};
var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
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Object.defineProperty(exports, "__esModule", { value: true });
exports.CheckpointTrie = void 0;
var baseTrie_1 = require("./baseTrie");
var checkpointDb_1 = require("./checkpointDb");
/**
 * Adds checkpointing to the {@link BaseTrie}
 */
var CheckpointTrie = /** @class */ (function (_super) {
    __extends(CheckpointTrie, _super);
    function CheckpointTrie() {
        var args = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            args[_i] = arguments[_i];
        }
        var _this = _super.apply(this, __spreadArray([], __read(args), false)) || this;
        _this.db = new (checkpointDb_1.CheckpointDB.bind.apply(checkpointDb_1.CheckpointDB, __spreadArray([void 0], __read(args), false)))();
        return _this;
    }
    Object.defineProperty(CheckpointTrie.prototype, "isCheckpoint", {
        /**
         * Is the trie during a checkpoint phase?
         */
        get: function () {
            return this.db.isCheckpoint;
        },
        enumerable: false,
        configurable: true
    });
    /**
     * Creates a checkpoint that can later be reverted to or committed.
     * After this is called, all changes can be reverted until `commit` is called.
     */
    CheckpointTrie.prototype.checkpoint = function () {
        this.db.checkpoint(this.root);
    };
    /**
     * Commits a checkpoint to disk, if current checkpoint is not nested.
     * If nested, only sets the parent checkpoint as current checkpoint.
     * @throws If not during a checkpoint phase
     */
    CheckpointTrie.prototype.commit = function () {
        return __awaiter(this, void 0, void 0, function () {
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        if (!this.isCheckpoint) {
                            throw new Error('trying to commit when not checkpointed');
                        }
                        return [4 /*yield*/, this.lock.wait()];
                    case 1:
                        _a.sent();
                        return [4 /*yield*/, this.db.commit()];
                    case 2:
                        _a.sent();
                        this.lock.signal();
                        return [2 /*return*/];
                }
            });
        });
    };
    /**
     * Reverts the trie to the state it was at when `checkpoint` was first called.
     * If during a nested checkpoint, sets root to most recent checkpoint, and sets
     * parent checkpoint as current.
     */
    CheckpointTrie.prototype.revert = function () {
        return __awaiter(this, void 0, void 0, function () {
            var _a;
            return __generator(this, function (_b) {
                switch (_b.label) {
                    case 0:
                        if (!this.isCheckpoint) {
                            throw new Error('trying to revert when not checkpointed');
                        }
                        return [4 /*yield*/, this.lock.wait()];
                    case 1:
                        _b.sent();
                        _a = this;
                        return [4 /*yield*/, this.db.revert()];
                    case 2:
                        _a.root = _b.sent();
                        this.lock.signal();
                        return [2 /*return*/];
                }
            });
        });
    };
    /**
     * Returns a copy of the underlying trie with the interface of CheckpointTrie.
     * @param includeCheckpoints - If true and during a checkpoint, the copy will contain the checkpointing metadata and will use the same scratch as underlying db.
     */
    CheckpointTrie.prototype.copy = function (includeCheckpoints) {
        if (includeCheckpoints === void 0) { includeCheckpoints = true; }
        var db = this.db.copy();
        var trie = new CheckpointTrie(db._leveldb, this.root);
        if (includeCheckpoints && this.isCheckpoint) {
            trie.db.checkpoints = __spreadArray([], __read(this.db.checkpoints), false);
        }
        return trie;
    };
    return CheckpointTrie;
}(baseTrie_1.Trie));
exports.CheckpointTrie = CheckpointTrie;
//# sourceMappingURL=checkpointTrie.js.map